Precipitation on ordered grid point,which is obtained from the Radar Estimating Precipitation model(REP) of Huanghe River and Huaihe River,is compared with the in situ data of a raingauge network.Results show that if the value of ground raingauge is taken as real value,then the optimal interpolation and joint calibration methods have the least root mean square errors,while the results of variational method are not very well due to parameter choosing.The calculating precision of Kalman filter method and average method is lower than the joint calibration method and optimal interpolation method.The method of Z-I has the largest root mean square errors.